Wide-pulse electrical stimulation to an intrinsic foot muscle induces acute functional changes in forefoot-rearfoot coupling behaviour during walking.
James, DC, Chesters, T, Sumners, DP, Cook, DP, Green, DA and Mileva, KN (2012). Wide-pulse electrical stimulation to an intrinsic foot muscle induces acute functional changes in forefoot-rearfoot coupling behaviour during walking. International Journal of Sports Medicine. 34 (5), pp. 438-443.
|Authors||James, DC, Chesters, T, Sumners, DP, Cook, DP, Green, DA and Mileva, KN|
Interventions for strengthening intrinsic foot muscles may be beneficial for rehabilitation from overuse injuries. In this study the acute effects of high-frequency, low-intensity wide-pulse electrical stimulation (WPS) over an intrinsic muscle on subsequent foot function during walking was assessed in healthy participants. WPS was delivered to the m. abductor hallucis (m.AH) of the non-dominant foot during relaxed standing. 3-dimensional forefoot (FF)--rearfoot (RF) coordination was quantified with a vector coding technique within separate periods of the stance phase to study WPS functional effects on foot motion. 4 types of coordinative strategies between the FF and RF were interpreted and compared PRE-to-POST-WPS for both the experimental and control feet. Bilateral electromyography (EMG) from m.AH was analysed during the intervention period for evidence of acute neuromuscular adaptation. The results showed that WPS significantly modulated FF-RF coordination during mid-stance, indicative of a more stable foot. Specifically, a statistically significant increase in FF eversion with concomitant RF inversion in the frontal plane and RF-dominated adduction in the transverse plane was observed. Subject-specific increases in post-stimulus m.AH EMG activation were observed but this was not reflected in an overall group effect. It is concluded that the structural integrity of the foot during walking is enhanced following an acute session of WPS and that this mechanical effect is most likely due to stimulation induced post-tetanic potentiation of synaptic transmission.
|Keywords||rehabilitation; wide-pulse electrical stimulation; foot; kinematic coupling; post-tetanic potentiation; Foot; Muscle, Skeletal; Humans; Electromyography; Walking; Analysis of Variance; Electric Stimulation; Adaptation, Physiological; Biomechanics; Adult; Female; Male; Adaptation, Physiological; Adult; Analysis of Variance; Biomechanical Phenomena; Electric Stimulation; Electromyography; Female; Foot; Humans; Male; Muscle, Skeletal; Walking; 1106 Human Movement And Sports Science; 0913 Mechanical Engineering; Sport Sciences|
|Journal||International Journal of Sports Medicine|
|Journal citation||34 (5), pp. 438-443|
|Digital Object Identifier (DOI)||doi:10.1055/s-0032-1321893|
|Web address (URL)||https://www.thieme-connect.com/products/ejournals/html/10.1055/s-0032-1321893|
|11 Oct 2012|
|Publication process dates|
|Deposited||31 May 2018|
|Accepted||02 Jul 2012|
|Accepted author manuscript|
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